Still investigating I have a fuse 30A and it is still alive Just googled that and looks like it could be 10A to 20A - no more if do not overloadso I need this converter then : http://www.ebay.com/itm/New-1200W-20A-D ... AQ:US:1123I do not want to buy another battery + another charger - only if I have no choice ... :):)

You might be able to use a pair of those in parallel. However be aware that your battery run time may be quite short. It draws additional amps to accomplish the voltage boost and you would be running two.

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Here is a circuit i think might work ..I've used 4 booster($4 each on ebay) with 10A max ... so should be able to handle 40A Will it anyhow close to a solution ? Not sure if i need to connect wires after boosters before(between) motors ...

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Last edited by Serg1140 on Tue Nov 03, 2015 9:47 am, edited 2 times in total.